Process for winding yarn

ABSTRACT

AN UNDERWINDING ELEMENT AND PROCESS FOR SPINNING FRAMES FIXED ON A SPINDLE FOR WINDING OF A COP. THE CIRCUMFERENTIAL GROOVE IS FILLED WITH THE WINDINGS OF THE UNDERWINDING COIL AND THE SLOTS ALLOW THE LEAD YARN TO BE WOVEN INTO AND ABOUT THE GROOVE. THE LEAD YARN IS UNDERWINDING COIL TO PREVENT LOOSE ENDS AND ROTATION OF THE UNDERWINDING COIL IN THE GROOVE. THE LEAD YARD IS MOVED UP AND DOWN TO BE INTERWOVEN BETWEEN THE SLOTS AND GROOVE AND GUIDED INTO PLACE BY THE RING AND RING COIL.

'Jal'l. 26, 1971 w. NAEGELI 3,557,545

. PROCESS FOR WINDING YARN Original Fil ed Jan. 20, 1967 2 Sheets-Sheet 1 INVENTOR. WERNER Nassau BY 2 W '2 K7 7' TORNS Y5 Jan. 26,- 1971 w. NAEGELI 3,557,545

, PROCESS FOR WINDING YARN Original Filed Jan. 20, 1967 2 Sheets-Sheet 2 I INVENTOR. WERNER NAEGEL I flTT RNEYS United States Patent Patent No. 3,490,218, dated Jan. 20, 1970.'Divided and this application May 6, 1969, Ser. No. 852,130

Claims priority, application Switzerland, Jan. 26, 1966,,

1,005/ 66 Int. Cl. B65h 65/00; D01h 1/38, 1/40 U.S. Cl. 57156 8 Claims ABSTRACT OF THE DISCLOSURE This is a division of application Ser. No.- 610,633, filed Jan. 20, 1967, now Pat. No. 3,490,218. i This invention relates 'to' process for'windi-ng yarn.

More particularly, the invention relates to process for I winding yarn on ring spinning and ring twisting frar'ries, and, still more particularly, for underwinding the yarn on these frames.

It has been known in the past when spinning yarn to underwind onto the bare spindle when spinning" onto Northrop bobbins (i.e. filling bobbins); the underwind ing reserve being wound as a rule on the'cylindrical part of the spindle. However, this underwinding has been "at tended with the disadvantage that the underwinding-coils Accordingly, it is an object of the invention to accommodate an underwinding on a spindle.

It is another object of the invention to sufiiciently compact and intimately join an underwinding coil on a spindle of a spinning or twister frame.

It is another object of the invention to provide process for underwinding on a spindle of a spinning or twister frame.

It is another object of the invention to provide process for underwinding a coil on a spindle which is relatively rapid and inexpensive.

It is another object'of the invention to reduce the maintenance of a spinning or twister frame.

It is another object of the invention to permit auto matic doffing of a spinning or twister frame.

Briefly, the invention provides an apparatus and process for underwinding a yarn on a spindle after a major remaining on the spindle must be removed manually after one or more dofiings. It has also been'known to provide a width of the cylindrical part of the spindlewith a fish skin grooving for positioning ofthe'underwinding're serve therein. In such cases, in order to attempt a mechanization of the dotting of the underwindingreserve, s'crapper elementshave been used which pass close to the underwinding reserve. However, such "attemptshave been unsuccessful since the underwindi ri'g' coils have opened under the centrifugal" force appliedand have thus become detached from the spindle so'th'at'dotfing in an orderly manner has been preventedj 4 In order to overcome these problems, the underwinding has in some instances, particularly in the case of warp yarn, been applied to the tube "carrying the yarn portion of the yarn has been wound on the bobbin.

The apparatus of the invention includes a spindle having an underwinding element positioned around the periphery thereof below the plane at which a yarn is wound on a bobbin an above a take-up section on the spindle. The underwinding element is formed with a groove peripheral of the spindle to accommodate an underwinding coil and with a series of substantially perpendicular slots communicating the groove with the exterior of the underwinding element to permit entry and exit of a yarn into the groove. The slots are disposed to either side of the groove to permit passage of a yarn in either direction out of or into the groove.

In another embodiment of the apparatus of the invention, the underwinding element is formed with a peripheral groove below the groove for the underwinding coil. This second groove is inclined upwardly to the axis of the spindle and serves to form a take-up section below and within the plane of the underwinding coil groove.

Still another embodiment of the apparatus includes an underwinding element having a take-up section which is positioned above the underwinding element and which communicates with an undnerwinding groove in the element through a series of slots.

The slots on the underwinding element are arranged above and below the underwinding groove in either of an aligned manner or a ciricumferentially offset manner.

The process of the invention includes the steps of initially taking-up of the trailing portion of the yarn not wound'on the bobbin' and winding that portion on the 1 Thereafter, the yarn is moved into a second plane coinin order to reduce the work required to keep the spindles 1 clean. Nevertheless, yarn residues have unavoidably accumulated on the spindles following each doffing and, as a rule, such residues have to be removed by an operator upon repairing of a thread break. Consequently, the application of the underwinding on the spindle has presently regained importance since only this application makes it possible to further automate the spinning process. However, the spindle must be designed to accommodate an underwinding coil andthe underwinding must be operated in a strictly controlled manner, rather than arbitrarily as has previously been the case, in order to sufilciently compact and intimately join the underwinding coil to the spindle. Only inthis way is it possible to subsequently remove theunderwinding coil satisfactorily by mechanical means.

cident with the take-up section of the spindle, again passing through a communicating slot in the element. The yarn is wound in this second plane for a very brief period of time and is then returned to the first plane where it again is wound into the underwinding groove to complete an underwinding coil. The underwinding coil which is thus formed is compact and intimately joined to the underwinding element.

Upon completion of the underwinding process, the yarn can be severed at a suitable point to permit the bobbin to be removed from the spindle while the underwinding coil remains on the underwinding element of the spindle in a neat clean manner. This facilitates the automatic doffing of the bobbins.

These and other objects and advantages of the invention will become more apparent from the following detailed description and appended claims taken in conjunction with the accompanying drawings in which:

1 FIG. 1 illustrates a front elevational view of a spindle of .the invention, partially cut-away, on a spinning frame;

FIG. 2 illustrates a top view of only the underwinding element of the spindle of FIG. 1;

FIG. 3 illustrates another embodiment of an underwinding element with an inclined take-up groove below an underwinding groove;

FIG. 4 schematically illustrates a partial development of the circumferential surface of the underwinding element of FIG. 1 with an outline of the lead yarn and underwinding coil;

FIG. illustrates an enlarged fragmentary view of the underwinding coil of FIG. 4 after coverage of the lead yarn;

FIG. 6 illustrates another embodiment of an underwinding element in a fragmentary partially cut-away view;

FIG. 7 schematically illustrates a partial development of the underwinding element of FIG. 6 with the lead yarn during take-up;

FIG. 8 schematically illustrates a partial development of an underwinding element having circumferentially offset slots on either side of an underwinding groove;

FIG. 9 schematically illustrates a partial development of another underwinding element; and

FIG. schematically illustrates a partial development similar to FIG. 4 with a modified coiling pattern.

Referring to FIG. 1, a spindle 2 of a plurality of spindles situated on a spinning frame is driven by a common drive belt 1 in a known manner. A tube 3 is positioned on the spindle 3 for the winding of a yarn 4 thereon and a vertically reciprocal moving ring 5 is positioned concentrically to the spindle. A traveller 6 is mounted on the ring 5 to travel around the ring 5 circumferentially of the spindle to lay the yarn on the tube 3. A ring rail 7 is positioned under the ring 5 in order to transmit vertical motion to the ring 5.

An underwinding element 9 is integrally formed on the spindle wharve 8 contacted by the drive belt 1 below the tube 3. The element 9 has a peripheral groove 10 for accommodating an underwinding coil 11 and a pair of limiting flanges 12, 13 which serve to define the walls of the groove 10.

In addition, referring to FIGS. 1 and 2, a plurality of recesses or slots 16 are formed over the peripheral edge of the underwinding element 9 to pass through the limiting flanges 12, 13 and to radially penetrate the bottom of the groove 10 (FIG. 2). The slots 16 are in substantial parallel alignment with the axis of the spindle 2.

Referring to FIGS. 1 and 4, in operation, after completion of a standard build-up of the yarn 4, with or without inclusion of a tip bunch (not shown), the ring rail 7 is lowered to form the underwinding coil 11. In the course of this lowering process, the yarn which is being guided toward the inside by the traveller 6 comes into contact with the limiting flange 12 and, depending on the respective speeds of the flange 12 and the traveller 6, the yarn is caught by one of the recesses or slots 16. As the ring rail 7 continues to descend the yarn 18 moves into the plane E of the groove .10 and becomes deflected at the edge 14 (FIG. 4) of the underwinding element 9 while beginning to fill the groove. Upon further lowering of the ring rail 7 from the plane E to beneath the limiting flange 13, the thread is caught again in a recess or slot '16 while deflecting twice at edges and 19 and wound up in the plane E of a take-up section 20 of the spindle 2. The yarn is wound up on the take-up section 20 for a very brief period only. In any event, the wind up length of the yarn on the take-up section 20 is to be just large enough to permit automatic and complete removal of the taken up yarn length from the spindle 2 during a subsequent mechanical dofling of the underwinding coil 11. Preferably, therefore, the yarn is wound onto the take-up section 20 over a length that is less than the entire circumference of the section with the ring rail 7 remaining in its lowermost position for a correspondingly short period of time.

Referring to FIGS. 1 and 5, after the yarn has been wound on the take-up section 20 for the required distance the ring rail 7 is raised so that the above described yarn catching process now occurs in reverse sequence, that is, the yarn enters one of the recesses or slots 16 of the lower flange 13 from underneath and then enters the groove .10. The yarn now remains substantially in that position and, as a result, the actual underwinding coil 11 is built up from individual circumferential windings 26- 31 (FIG. 5).

The number of windings in the underwinding coil depends upon the deceleration of the ring spinning or twisting frame motor upon braking (e.g. through an exterior braking assembly). As a rule braking of the motor occurs during the lowering of the ring rail 7. For economic considerations it is naturally appropriate to keep the number of windings as low as possible since such material constitutes waste. This object is readily achieved since the lead yarn is systematically bound in on the underwinding element 9 and need subsequently be covered by only a few circumferential windings in the groove 10.

Referring to FIG. 10, the coiling pattern on the underwinding part 9 obviously depends on the wind-up speed of the yarn and the chronologic behavior of the ring rail 7. Thus, for example, all other conditions remaining equal, in the case of a slower lowering of the ring rail 7 and an extremely brief dwell interval in its lowest position than that used for the coiling pattern illustrated in FIG. 4, the resultant coiling pattern substantially corresponds to that shown in FIG. 10. This provides for a weaving in and tightening of the lead yarn 21 by de flecting it several times into portions 22-25 of the underwinding element 9 and permits intimate joining of the lead yarn with the spindle by means of the coil 11 proper.

After an underwinding has been formed, the yarn is torn off slightly above the underwinding element 9, approximately at R (BIG. 1) and the yarn 4 including tube 3 is removed from the spindle 2. After fitting of another empty tube onto the spindle 2, the ring rail 7 is raised in a known manner into initial spinning position and the machine reactuated. This results in the entry of the yarn 32 (FIG. 4) at the end of an underwinding coil into any recess 16 of the upper limiting flange 12 for passage from there onto the freshly inserted empty tube.

Referring to FIG. 3, an underwinding element 33 is upwardly and inwardly recessed at an angle to form a groove 35 beneath the underwinding groove 34. As a result, the space between the plane E coincident with the underwinding groove 34, and the plane E coincident with the adjoining take-up section 36 is considerably reduced. Likewise, the circumferentially arranged recesses or slots 37 coming from the take-up section 36 penetrate deeper into the underwinding element 33 then the bottom of the groove 34. This arrangement makes it possible to maintain the angle or between the plane 'E and the path of the yarn from the groove 34 to the take-up section 34 very small. Thus, upon re-entry from below into the groove 34, the yarn is positioned profoundly on the bottom of the groove 34 and is therefore also satisfactorily covered by the subsequent underwriting coil 11. This is very important for the subsequent mechanical dofling of the coil in that one can prevent a premature severing of the lead yarn holding the coil 11 which severing would result in a sliding of the coil in the groove 34 making positive dofling impossible.

In other respects, the coiling pattern resulting in this underwinding element 33 substantially corresponds to that shown in FIGS. '4 and 10.

Referring to FIGS. 6 and 7, a spindle 2' is integrally formed with an underwinding element 9 having a groove 10' defined by a shoulder 45 of the spindle 2 and a single limiting flange 12'. Also, a take-up section 46 is provided on the upper part of the underwinding element 9' and, as above, a series of peripherally spaced recesses or slots 16 are formed in the limiting flange, shoulder, groove 10' and take-up section 46. In operation, following inthe ring rail. Thereupon, the yarn returns immediately into the plane E to complete the underwinding coil 11". Also, in this instance, the lead yarn is first woven-in into parts of the underwinding section by subjecting it to a plurality of deflections, and then covered. Each deflection represents an increase in friction and hence, even with few terminal windings, trouble free restarting of spinning and favorable conditions for mechanical dofling of the coil 11 are created.

Referring to FIG. 8, a coiling pattern can be produced to effect a greater number of yarn deflections by circumferentially displacing the recesses 40 and 41 of the upper and lower limiting flange with respect to each other rather than arranging these recesses in facing relation.

Referring to FIG. 9, the binding-in and tightening of a lead yarn by coil 11" can be assured in recesses 42 which are circumferentially greatly enlarged while being just as deep as the groove 43 at the point of intersection 44.

In order to achieve a reliable guidance of the yarn, it has generally been found to be advantageous to keep the diameter of the limiting flange large. In extreme cases, it may correspond to the maximum diameter of the cop. This provision also makes it possible to minimize the travel motions of the ring rail in view of the fact that that the catching of the yarn by the recesses upon transition from one coiling plane to another occurs much more readily.

The invention described creates the prerequisites indispensable for the automating of ring spinning. On the other hand, following removal of the filled cop, the woven-in and tightened lead yarn of the underwinding coil is no longer detached as a result of centrifugal force, thereby eliminating entangling during spinning restart and guaranteeing a clean spinning process all around. On the other hand, the systematic weaving-in and tightening of the lead yarn is actually the factor that makes it possible to achieve positive and trouble free dofling of the underwinding coil by means of a simple underwinding element. The underwinding coil can neither rotate nor open up by centrifugal force in the groove, rather, following the spinning-n of the lead yarn for a new cop, it can be dolfed at any time without any difiiculty from the outside to the inside. For the very same reason, the number of terminal windings can also be kept to a minimum, which is in the interest of achieving low material wastes.

In addition, the spindles remain perfectly clean at all times. A locking or jamming of the tubes on the spindles as a result of the presence of uncontrolled yarn residues does not occur. Even the cops themselves are neat and clean in appearance thereby making them suitable for automatic spooling.

Having thus described the invention it is not intended that it be so limited as changes may be readily made therein without departing from the scope of the invention. Ac-

cordingly, it is intended that the subject matter described above and shown in the drawings be interpreted as illustrative and not in a limiting sense.

What is claimed is:

' 1. A process for underwinding yarn on a spindle of a spinning frame comprising the steps of:

initially winding a lead yarn in a first plane about an axis of the spindle,

subsequently moving the yarn into a second plane parallel to and spaced from said first plane,

winding the yarn in said second plane about said axis,

thereafter returning the yarn into said first plane, and

winding the yarn in said first plane about said axis to form an underwinding coil of a plurality of windings over the yarn passing between said first and second planes.

2. A process as set forth in claim 1 wherein said step of winding the yarn in said second plane consists in winding the yarn over a length less than the length of a complete winding.

3. A process as set forth in claim 2 wherein the yarn is initially wound over a length less than the length of a complete winding in said first plane.

4. A process as set forth in claim 2 wherein said second plane is vertically below said first plane.

5. A process as set forth in claim '6 wherein the yarn is horizontally deflected in passing between said first and second planes.

6. A process as set forth in claim 5 wherein the underwinding coil is formed over a yarn passing between said first and second planes prior to a deflection of the yarn between said planes.

7. A process as set forth in claim 6 wherein the yarn is horizontally deflected prior to said step of initially winding the yarn in said first plane and the underwinding coil is formed over the yarn in said first plane after said horizontal deflection of the yarn.

8. A process for underwinding yarn on a spindle of a spinning frame comprising the steps of initially passing the thread transversely through a first plane to a second plane being disposed parallel to a first plane, winding the yarn in the second plane, thereafter returning the yarn to the first plane and winding in the first plane a plurality of windings over the yarn passing through said plane there by securing the yarn windings.

References Cited UNITED STATES PATENTS 2,964,897 12/1960 Bakker 57-34 3,095,683 7/1963 Tessmer 5734 3,122,874 3/1964 Tessmer et al. 57-34 3,210,922 10/1965 Winter 5734 3,263,409 8/ 1966 Znidema 57-156 3,284,026 11/1966 Zuidema 242- 3,319,409 5/1967 Bakker 5734- DONALD E. WATKINS, Primary Examiner 

